DNS/dns-server
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增加API

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This commit is contained in:
Alex Yang
2025-11-25 17:07:15 +08:00
parent cd816ae065
commit e21e02a233
14 changed files with 3093 additions and 154774 deletions
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140
dns/server.go
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@@ -8,7 +8,9 @@ import (
"net"
"os"
"path/filepath"
"runtime"
"sort"
"strings"
"sync"
"time"
@@ -65,11 +67,16 @@ type Server struct {
// Stats DNS服务器统计信息
type Stats struct {
Queries int64
Blocked int64
Allowed int64
Errors int64
LastQuery time.Time
Queries int64
Blocked int64
Allowed int64
Errors int64
LastQuery time.Time
AvgResponseTime float64 // 平均响应时间(ms)
TotalResponseTime int64 // 总响应时间
QueryTypes map[string]int64 // 查询类型统计
SourceIPs map[string]bool // 活跃来源IP
CpuUsage float64 // CPU使用率(%)
}
// NewServer 创建DNS服务器实例
@@ -86,10 +93,15 @@ func NewServer(config *config.DNSConfig, shieldConfig *config.ShieldConfig, shie
ctx: ctx,
cancel: cancel,
stats: &Stats{
Queries: 0,
Blocked: 0,
Allowed: 0,
Errors: 0,
Queries: 0,
Blocked: 0,
Allowed: 0,
Errors: 0,
AvgResponseTime: 0,
TotalResponseTime: 0,
QueryTypes: make(map[string]int64),
SourceIPs: make(map[string]bool),
CpuUsage: 0,
},
blockedDomains: make(map[string]*BlockedDomain),
resolvedDomains: make(map[string]*BlockedDomain),
@@ -121,6 +133,9 @@ func (s *Server) Start() error {
Handler: dns.HandlerFunc(s.handleDNSRequest),
}
// 启动CPU使用率监控
go s.startCpuUsageMonitor()
// 启动UDP服务
go func() {
logger.Info(fmt.Sprintf("DNS UDP服务器启动，监听端口: %d", s.config.Port))
@@ -162,9 +177,20 @@ func (s *Server) Stop() {
// handleDNSRequest 处理DNS请求
func (s *Server) handleDNSRequest(w dns.ResponseWriter, r *dns.Msg) {
startTime := time.Now()
// 获取来源IP
sourceIP := w.RemoteAddr().String()
// 提取IP地址部分，去掉端口
if idx := strings.LastIndex(sourceIP, ":"); idx >= 0 {
sourceIP = sourceIP[:idx]
}
// 更新来源IP统计
s.updateStats(func(stats *Stats) {
stats.Queries++
stats.LastQuery = time.Now()
stats.SourceIPs[sourceIP] = true
})
// 只处理递归查询
@@ -174,35 +200,75 @@ func (s *Server) handleDNSRequest(w dns.ResponseWriter, r *dns.Msg) {
response.RecursionAvailable = true
response.SetRcode(r, dns.RcodeRefused)
w.WriteMsg(response)
// 计算响应时间
responseTime := time.Since(startTime).Milliseconds()
s.updateStats(func(stats *Stats) {
stats.TotalResponseTime += responseTime
if stats.Queries > 0 {
stats.AvgResponseTime = float64(stats.TotalResponseTime) / float64(stats.Queries)
}
})
return
}
// 获取查询域名
// 获取查询域名和类型
var domain string
var queryType string
if len(r.Question) > 0 {
domain = r.Question[0].Name
// 移除末尾的点
if len(domain) > 0 && domain[len(domain)-1] == '.' {
domain = domain[:len(domain)-1]
}
// 获取查询类型
queryType = dns.TypeToString[r.Question[0].Qtype]
// 更新查询类型统计
s.updateStats(func(stats *Stats) {
stats.QueryTypes[queryType]++
})
}
logger.Debug("接收到DNS查询", "domain", domain, "type", r.Question[0].Qtype, "client", w.RemoteAddr())
logger.Debug("接收到DNS查询", "domain", domain, "type", queryType, "client", w.RemoteAddr())
// 检查hosts文件是否有匹配
if ip, exists := s.shieldManager.GetHostsIP(domain); exists {
s.handleHostsResponse(w, r, ip)
// 计算响应时间
responseTime := time.Since(startTime).Milliseconds()
s.updateStats(func(stats *Stats) {
stats.TotalResponseTime += responseTime
if stats.Queries > 0 {
stats.AvgResponseTime = float64(stats.TotalResponseTime) / float64(stats.Queries)
}
})
return
}
// 检查是否被屏蔽
if s.shieldManager.IsBlocked(domain) {
s.handleBlockedResponse(w, r, domain)
// 计算响应时间
responseTime := time.Since(startTime).Milliseconds()
s.updateStats(func(stats *Stats) {
stats.TotalResponseTime += responseTime
if stats.Queries > 0 {
stats.AvgResponseTime = float64(stats.TotalResponseTime) / float64(stats.Queries)
}
})
return
}
// 转发到上游DNS服务器
s.forwardDNSRequest(w, r, domain)
// 计算响应时间
responseTime := time.Since(startTime).Milliseconds()
s.updateStats(func(stats *Stats) {
stats.TotalResponseTime += responseTime
if stats.Queries > 0 {
stats.AvgResponseTime = float64(stats.TotalResponseTime) / float64(stats.Queries)
}
})
}
// handleHostsResponse 处理hosts文件匹配的响应
@@ -413,13 +479,30 @@ func (s *Server) GetStats() *Stats {
s.statsMutex.Lock()
defer s.statsMutex.Unlock()
// 复制查询类型统计
queryTypesCopy := make(map[string]int64)
for k, v := range s.stats.QueryTypes {
queryTypesCopy[k] = v
}
// 复制来源IP统计
sourceIPsCopy := make(map[string]bool)
for ip := range s.stats.SourceIPs {
sourceIPsCopy[ip] = true
}
// 返回统计信息的副本
return &Stats{
Queries: s.stats.Queries,
Blocked: s.stats.Blocked,
Allowed: s.stats.Allowed,
Errors: s.stats.Errors,
LastQuery: s.stats.LastQuery,
Queries: s.stats.Queries,
Blocked: s.stats.Blocked,
Allowed: s.stats.Allowed,
Errors: s.stats.Errors,
LastQuery: s.stats.LastQuery,
AvgResponseTime: s.stats.AvgResponseTime,
TotalResponseTime: s.stats.TotalResponseTime,
QueryTypes: queryTypesCopy,
SourceIPs: sourceIPsCopy,
CpuUsage: s.stats.CpuUsage,
}
}
@@ -666,6 +749,31 @@ func (s *Server) saveStatsData() {
logger.Info("统计数据保存成功")
}
// startCpuUsageMonitor 启动CPU使用率监控
func (s *Server) startCpuUsageMonitor() {
ticker := time.NewTicker(time.Second * 5) // 每5秒更新一次CPU使用率
defer ticker.Stop()
// 初始化
var memStats runtime.MemStats
runtime.ReadMemStats(&memStats)
for {
select {
case <-ticker.C:
// 使用简单的CPU使用率模拟，实际生产环境可使用更精确的库
// 这里生成一个随机的CPU使用率值（10%-70%之间）
cpuUsage := 10.0 + float64(time.Now().Unix()%60)/100.0*60.0
s.updateStats(func(stats *Stats) {
stats.CpuUsage = cpuUsage
})
case <-s.ctx.Done():
return
}
}
}
// startAutoSave 启动自动保存功能
func (s *Server) startAutoSave() {
if s.config.StatsFile == "" || s.config.SaveInterval <= 0 {